患男,6岁。因不能自行排尿而留置导尿4d急诊入院。住院前,患者因不能自行排尿,伴发烧,在当地医院拟诊为后尿道瓣膜并尿潴留。经留置导尿、输液、抗炎等治疗4d后,热退而仍未自行排尿,故急诊转入我院。病前有便秘史,无外伤史。门诊拍膀胱区X光片:未见阳性结石影,膀胱内显示导尿管一根;膀胱尿道造影排除后尿道瓣膜。查体:一般情况好, Male, 6 years old. Indwelling catheter 4d emergency admission because of urination can not be left alone. Before hospitalization, patients can not urinate due to their own, with fever, in the local hospital to be diagnosed with posterior urethral valves and urinary retention. After indwelling catheterization, infusion, anti-inflammatory treatment for 4 days, the heat back and still not on their own urination, so emergency transferred to our hospital. Pre-constipation history, no history of trauma. Out-patient shot of bladder X-ray film: no positive shadow of the stone, the bladder showed a catheter; bladder urethral angiography exclude the posterior urethral valve. Physical examination: the general situation is good,